docs: def breadcrumbs(category_string, separator=' > ', using='categories.category'):
      """
      {% breadcrumbs category separator="::" using="categories.category" %}
  
      Render breadcrumbs, using the ``categories/breadcrumbs.html`` template,
      using the optional ``separator`` argument.
      """
      cat = get_category(category_string, using)
  
      return {'category': cat, 'separator': separator}